Improvement in spark-arresters



R. N, WILLIAMS.

Improvement in Spark-Arresters'.

Patented luly 2,1872.

UNITED, STATES PATENT OFFIoE.

IMPROVEMENT I N SPARK-ARRESTERS.

Specification forming part of Letters Patent No. 128,693, dated J nly 2,1872.

Specification describing a certain Improvement in Spark-Arresters,invented by R. N. WILLIAMS, residing at Lewistown,in the county ofMifflin and State of Pennsylvania.

The subject of my invention is a spark-arrester, which ismore.especiallydesigned for use in connection with stoves and furnaces,but which is equally well adapted for the smoke-stacks of locomotive andmarine boilers. My improvement consists in the employment in a suitablechamber, to be attached to the flue or stack, of a series ofconcave-convex shelves or deflectors, through which the unconsumedproducts of combustion are made to pass in a tortuous manner, everyalternate deflector having an opening in the center, while theintermediate ones are constructed with openings near each end. Thus inpassing up through'one of the deflectors the products of combustionstrike the solid portions of the next one above before they-are allowedto pass through it, causing the separation of the sparks and cindersfrom the lighter smoke, and their deposition upon the deflectors. Tostill further increase the etflciency of the device I form projectinglips or flanges upon the under side of the deflectors near the openingstherein, so as to form eddies at those points.

Figure 1 is a sectional elevation of 7 my improved spark arrester,showing the door of the chamber swung open. Figs. 2 and 3 represent inperspective the two forms of concavoconvex deflectors employed in theconstruction of the spark-arrester.

The chamber A is provided with a short end of pipe at each end forconnection to the smoke-pipe. It is preferably made square, though itmay have any other desired form in cross-section, and provided with adoor, B, through which access may be had to its interior for the purposeof cleaning it and removing the deposits on the shelves or deflectors Band 0. These are made of the concavo-convex form indicated, withhorizontal flanges to enter between guides at on the interior of thechamber, by which they are firmly held in place. In arranging them inthe chamber, they are disposed with their convex side up, as shown,andany number, from two upward, may be employed, according tocircumstances. The deflectors B are provided with an opening in thecenter, while in those marked 0 two openings are formed, one in eachend, the OOlIl bined areas of such two openings being about equal to themain the deflectors marked B, and the openings in the several deflectorsstand in such relation to one another that the unconsumed products ofcombustion are compelled to pass in a tortuous manner through thechamber, striking against the solid portions of each deflector, whichcauses the proper separation of the sparks and cinders. These aredeposited upon the several deflectors, and must be removed from time totime. 0 refer to projecting flanges upon the under side of thedeflectors, which form recesses in connection therewith to aid inarresting the solid or heavier particles carried up with the smoke. Theform of the deflectors may be somewhat modified, but aslong as they arein the form of an inverted trough they will act substantially like thoseshown, and, consequently, be substantially the same. v

\Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination of the case A and concave-convex deflectors B and O,substantially as and for the purpose specified.

2. The projecting lips or flanges on the under side of the deflectors,substantially as and for the purpose specified.

In testimony whereof I have hereunto signed my name this 11th day ofMarch, A; D. 1872, in the presence of two subscribing witnesses.

ROBERT N. WILLIAMS.

Witnesses:

GEO. MURREY, JOHN L. HIMES.

B and

